Find the unit Digit of expression 7^(1!+2!+.......+200!)

• d correct ans wil b 7 becoz after 4! all numbers are divisible from 4 and d cyclicity of 7 is 7,9,3,1 so add (1!+2!+3!+4!) = 33/4 = 8*4 + 1 so d remainder is 1 ...thrfor ans will b 7..
• 11 years agoHelpfull: Yes(1) No(0)
• 1 + 2 + 6 + 24 + 120 + __0 + __0 + .......
  we get unit digit as 3
  after multiplying it with 7 get 1 as a unit digit
  answer is 1
• 11 years agoHelpfull: Yes(0) No(1)